import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User:龙宝
 * Date:2022-12-16
 * Time:19:05
 */
public class DBUtil {
    private static DataSource dataSource = null;

    public static DataSource getDataSource() {
        if(dataSource == null) {
            synchronized (DBUtil.class) {
                if (dataSource == null) {
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setURL("jdbc:mysql://127.0.0.1:3306/MyBlog?characterEncoding=utf8&useSSL=false");
                    ((MysqlDataSource)dataSource).setUser("root");
                    ((MysqlDataSource)dataSource).setPassword("0410");
                }
            }
        }
        return  dataSource;
    }

    public  static Connection getConnection() {
        try {
            return getDataSource().getConnection();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        }
    }
    //建立连接
    public static void close(Connection connection, PreparedStatement statement , ResultSet resultSet) {
        if(resultSet != null) {
            try {
                resultSet.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        if(statement != null) {
            try {
                statement.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
        if(connection != null) {
            try {
                connection.close();
            } catch (SQLException e) {
                throw new RuntimeException(e);
            }
        }
    }

}
